﻿// Copyright Dirk Lemstra https://github.com/dlemstra/Magick.NET.
// Licensed under the Apache License, Version 2.0.

using System;
using ImageMagick;
using Xunit;

namespace Magick.NET.Tests;

public partial class MagickImageCollectionTests
{
    public class TheIndexProperty
    {
        [Fact]
        public void ShouldThrowExceptionWhenValueIsNull()
        {
            using var images = new MagickImageCollection();

            var exception = Assert.Throws<InvalidOperationException>(() => images[0] = null);
            Assert.Equal("Not allowed to set null value.", exception.Message);
        }

        [Fact]
        public void ShouldThrowExceptionWhenAddingTheSameImage()
        {
            using var images = new MagickImageCollection
            {
                new MagickImage(MagickColors.Red, 1, 1),
                new MagickImage(MagickColors.Red, 1, 1),
            };

            var exception = Assert.Throws<InvalidOperationException>(() => images[0] = images[1]);

            Assert.Equal("Not allowed to add the same image to the collection.", exception.Message);
        }

        [Fact]
        public void ShouldBeAbleToOverwriteImageWithSameImage()
        {
            using var images = new MagickImageCollection();
            var image = new MagickImage(MagickColors.Red, 1, 1);
            images.Add(image);

            images[0] = images[0];

            Assert.Same(image, images[0]);
        }
    }
}
